Alumina-silica refractory brick containing light porous aggegate and its making process

A technology of porous aggregates and refractory bricks, applied in the field of refractory materials, can solve the problems that affect the safe production of high-temperature furnaces or containers, the advantages of dense aggregates are not obvious, and the service life is affected, so as to achieve good resistance to the erosion of slag and other media. The effect of scouring ability, good resistance to slag erosion, and good thermal insulation performance

Inactive Publication Date: 2007-11-07
WUHAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional lightweight insulation materials such as diatomite bricks, asbestos bricks, vermiculite bricks, lightweight clay bricks, lightweight mullite and lightweight corundum bricks cannot be used in parts that are in direct contact with liquid or other media.
Because it is susceptible to erosion and erosion of the working medium (Xu Pingkun, Dong Yingbang. Corundum refractories. Beijing: Metallurgical Industry Press, 1999; Wang Weibang. Refractory Technology. Beijing: Metallurgical Industry Press, 1994), affecting the service life, even Affect the safe production of high temperature kiln or container
On the other hand, in trad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] An aluminum-silica refractory brick containing lightweight porous aggregates and a preparation method thereof: lightweight porous corundum (Al 2 o 3 content ≥ 97wt%), light porous corundum (Al 2 o 3 Corundum fine powder (Al 2 o 3 content≥95wt%), mullite fine powder (Al 2 o 3 α-Al with a content of 66wt%) and a particle size 2 o 3 Micropowder (Al 2 o 3 Content ≥ 97wt%) are mixed according to 30-35wt%, 25-30wt%, 15-20wt%, 5-10wt% and 5-10wt% respectively; Among them, the apparent porosity of lightweight porous corundum is greater than 20%, and the average pore diameter is less than 30 μm. Add 3-5wt% pulp waste liquid of the above-mentioned mixture as a binder, stir evenly, and then machine-press molding at a molding pressure of 120-150Mpa, and dry the molded green body at 120-140°C for 16-24 hours. Apparent porosity of 40-45%, bulk density of 2.30-2.40g / cm can be obtained 3 , Aluminosilicate unburned refractory bricks containing lightweight porous aggregates wi...

Embodiment 2

[0015] An aluminum-silica refractory brick containing lightweight porous aggregates and a preparation method thereof: lightweight porous mullite (Al 2 o 3 Content is 66wt%), light porous mullite (Al 2 o 3 Content is 76wt%), mullite (Al 2 o 3 Content is 66wt%), corundum fine powder (Al 2 o 3 content≥95wt%), mullite fine powder (Al 2 o 3 Content is 66wt%), clay fine powder (Al 2 o 3 α-Al with a content of 30 wt%) and a particle size 2 o 3 Micropowder (Al 2 o 3 content ≥ 97wt%), mixed according to 15-20wt%, 15-20wt%, 25-30wt%, 12-22wt%, 5-10wt%, 5-8wt% and 4-6wt% respectively; Among them, light porous Mo The apparent porosity of the stones is greater than 20%, and the average pore diameter is less than 30 μm. Add 3-5wt% of the above-mentioned mixture and silica sol with a concentration of 30-40wt% as a binder, mix evenly, and press molding with a molding pressure of 100-130Mpa. The molded body is dried at 100-130° C. for 24-48 hours. Apparent porosity of 37-45%, bu...

Embodiment 3

[0017] An aluminum-silica refractory brick containing lightweight porous aggregates and a preparation method thereof: lightweight porous mullite (Al 2 o 3 Content is 76wt%), light porous mullite (Al 2 o 3 Content is 66wt%), corundum fine powder (Al 2 o 3 content≥95wt%), mullite fine powder (Al 2o 3 Content is 66wt%), clay fine powder (Al 2 o 3 α-Al with a content of 40 wt%) and a particle size 2 o 3 Micropowder (Al 2 o 3 Content ≥ 97wt%) are mixed according to 30~35wt%, 25~30wt%, 5~10wt%, 10~15wt%, 5~10wt% and 8~10wt% respectively; Among them, the apparent porosity of light porous mullite Both are greater than 20%, and the average pore diameter is less than 30 μm. Add 3-5wt% of the above-mentioned mixture and silica sol with a concentration of 30-35wt% as a binder and mix evenly, and press molding with a molding pressure of 130-150Mpa. The molded body is dried at 130-150°C for 12-24 hours to obtain an apparent porosity of 38-42% and a bulk density of 2.38-2.52g / cm ...

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Abstract

The present invention relates to one kind of alumina-silica refractory brick containing light porous aggregate and its production process. The technological scheme is that the alumina-silica refractory brick is produced with light porous Al2O3-SiO2 refractory material 30-70 wt%, compact Al2O3-SiO2 refractory material 0-35 wt%, fine corundum powder 5-25 wt%, fine alpha-Al2O3 powder 3-10 wt%, fine mullite powder 5-15 wt% and fine clay powder 0-10 wt%, and through mixture, adding waste pulp liquid in 3-7 wt% and one or two kinds of silicasol as binding agent, stirring, pressing to form adobe, drying at 100-150 deg.c for 12-48 hr, sintering at 1400-1600 deg.c for 2-5 hr and naturally cooling. The alumina-silica refractory brick has high macro porosity, small average pore size, low heat conductivity and high medium erosion resistance, and may be used in the permanent layer or work layer in high temperature kiln, furnace and container.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to an aluminum-silica refractory brick containing lightweight porous aggregate and a preparation method thereof. Background technique [0002] With the world's increasing requirements for reducing energy consumption and saving energy, the requirements for lightweight insulation materials are increasing. However, traditional lightweight insulation materials such as diatomite bricks, asbestos bricks, vermiculite bricks, lightweight clay bricks, lightweight mullite and lightweight corundum bricks cannot be used in parts that are in direct contact with liquid or other media. Because it is susceptible to erosion and erosion of the working medium (Xu Pingkun, Dong Yingbang. Corundum refractories. Beijing: Metallurgical Industry Press, 1999; Wang Weibang. Refractory Technology. Beijing: Metallurgical Industry Press, 1994), affecting the service life, even Affect t...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/10C04B35/185C04B35/622C04B35/14
Inventor 李楠彭从华
Owner WUHAN UNIV OF SCI & TECH
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